<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-alert title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false">
      </el-alert>

      <!-- 步骤条 -->

      <el-steps :space="200"
                :active="activeIndex-0"
                finish-status="success"
                align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- Tab标签页 -->
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px"
               label-position="top">
        <el-tabs :tab-position="tabPosition"
                 v-model="activeIndex"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClick()">
          <el-tab-pane label="基本信息"
                       name="0">
            <el-form-item label="商品名称"
                          prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格"
                          prop="goods_price">
              <el-input v-model="addForm.goods_price"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量"
                          prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量"
                          prop="goods_number"
                          type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <!-- 级联选择器 -->
            <el-form-item label="商品分类"
                          prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat"
                           :options="cateList"
                           :props="cateProps"
                           @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数"
                       name="1">
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTabData"
                          :key="item.attr_id"
                          class="form_item">
              <!-- 复选款组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb"
                             v-for="(cb,i) in item.attr_vals"
                             :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性"
                       name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTabData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片"
                       name="3">
            <!-- 商品图片上传 -->
            <el-upload action="https://www.liulongbin.top:8888/api/private/v1/upload"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       list-type="picture"
                       :headers="headersObj"
                       :on-success="handleSuccess">
              <el-button size="small"
                         type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容"
                       name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 底部添加按钮 -->
            <el-button type="primary"
                       class="btn_add"
                       @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览"
               :visible.sync="previewVisible"
               width="40%">
      <img :src="previewPath"
           alt="图片加载失败"
           class="preview_img">
    </el-dialog>
  </div>
</template>

<script>
import _ from "lodash"

export default {
  data () {
    return {
      activeIndex: "0", //默认被激活的步骤条下标
      tabPosition: "left",
      //添加表单的数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 图片上传完成之后的临时地址
        pics: [],
        //商品的详情描述
        goods_introduce: "",
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {
            required: true, message: "请输入商品名称", trigger: "blur"
          }
        ],
        goods_price: [
          {
            required: true, message: "请输入商品价格", trigger: "blur"
          }
        ],
        goods_weight: [
          {
            required: true, message: "请输入商品重量", trigger: "blur"
          }
        ],
        goods_number: [
          {
            required: true, message: "请输入商品数量", trigger: "blur"
          }
        ],
        goods_cat: [
          {
            required: true, message: "请选择商品分类", trigger: "blur"
          }
        ]
      },
      //商品分类列表
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      // 动态参数的数据
      manyTabData: [],
      // 静态属性的数据
      onlyTabData: [],
      // 图片上传请求头
      headersObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      previewPath: "",
      // 图片预览对话框显示/隐藏
      previewVisible: false
    }
  },
  methods: {
    // 获取商品分类列表
    async getCateList () {
      const { data: res } = await this.$ajax.get("/categories")
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类列表失败")
      }
      this.cateList = res.data
    },
    // 级联选择器发生变化
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = []
      }
    },
    // 当标签页点击离开时的时候
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类")
        return false
      }
    },
    // 当标签页被点击的时候出发
    async tabClick () {
      if (this.activeIndex === "1") {
        const { data: res } = await this.$ajax.get(`/categories/${this.cateId}/attributes`, {
          params: {
            sel: "many"
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败")
        }

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ")
        })
        this.manyTabData = res.data
      } else if (this.activeIndex === "2") {
        const { data: res } = await this.$ajax.get(`/categories/${this.cateId}/attributes`, {
          params: {
            sel: "only"
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性列表失败")
        }

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ")
        })
        this.onlyTabData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理图片删除时的效果
    handleRemove (file) {
      const filePath = file.response.data.tmp_path
      const index = this.addForm.pics.findIndex(x => x.pic === filePath)
      this.addForm.pics.splice(index, 1)
    },
    // 图片上传成功之后的操作
    handleSuccess (response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品按钮
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项")
        }
        const form = _.cloneDeep(this.addForm) // 深拷贝
        form.goods_cat = form.goods_cat.join(",")

        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(",")
          }
          this.addForm.attrs.push(newInfo)
        })

        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        // 发起添加商品请求
        const { data: res } = await this.$ajax.post("/goods", form)
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败")
        }

        this.$message.success("添加商品成功")
        this.$router.push("/goods")
      })
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-steps,
.el-tabs {
  margin-top: 20px;
}

.form_item {
  margin: 0;
}

.preview_img {
  width: 100%;
}

.btn_add {
  margin-top: 20px;
}
</style>